I have had that done on the lower cat that was plugged. The ones in the Y are such a mess to work on I was hoping to replace the whole Y. Even so I am checking with a couple places. Waiting for one to reply then I will check the other. My usual go to for exhaust will not do this for me.
I am just curious to find out what people are doing if the catalytics are bad on the Y pipe on thier 318. I have a 1983 fifth avenue and the catalytics are bad in the Y pipe. I would like to remove them and put a Y pipe with no catalytics in it but I cannot seem to find those anywhere.